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The Duty of Engagement: An analysis of the 2016 European Co..:

Byrne, S ; Ludvigsen, J
https://researchonline.ljmu.ac.uk/id/eprint/20069/1/The%20duty%20of%20engagement%20and%20analysis%20of%20the%202016%20European%20Convention%20on%20an%20integrated%20safety,%20security%20and%20service%20apporach%20at%20football%20matches%20and%20other%20events.pdf.  , 2023